First off, thanks for Windy, it's really an amazing tool for everything weather-related and more.
However, I have a question about the Air Quality layer: why does it only show PM10 data under "Measured values" for the official Slovenian monitoring stations, regardless of what is selected in the sidebar?
This station is for the town Koper (Slovenia), which in fact also reports PM2.5, O3 and NO2 values on the Slovenian government website, yet in Windy only PM10 is displayed for some reason.
Same goes for the capital Ljubljana (there are 3 official stations there), e.g.: https://www.windy.com/airq/46.066-14.517-oaq?camsEu,pm2p5,46.070,14.509,16
This one should not only display PM2.5, PM10, O3 and NO2, but also CO, yet Windy only shows PM10. Pretty much all the official stations report both PM10 and PM2.5 at the very least, while many of them also report other values such as O3 and NO2.
It seems that Windy only displays/fetches PM10 values for all the official Slovenian stations, not just the two mentioned above.
See here for the complete list of official Slovenian monitoring stations and their hourly values: https://www.arso.gov.si/zrak/kakovost zraka/podatki/dnevne_koncentracije.html
Here is also the XML file with all the stations and their values (updated hourly) for your reference: http://www.arso.gov.si/xml/zrak/ones_zrak_urni_podatki_zadnji.xml
I think it would be useful if you could update the data to be fetched from the above XML, rather than what you are currently using, as PM10 values are certainly not as useful and representative as PM2.5.
Looking forward to your reply!